Update mostly related to filter, rewritten to fully support any color mode (L, LA, RGB, RGBA). Added wrap around processing for seamless textures and options for protect alpha/filter alpha channel.

Averager.py GUI rewritten to work with new filter features, more informate "Info" added, filtered/saved status shown to mimic Photoshop/Fireworks/Paint Shop Pro.

POVRayThread.py got minimal update to cope with new filter.